Help with merging tickets in Zendesk

Understanding how calls become tickets: https://support.zendesk.com/hc/en-us/articles/4408821302810-Understanding-how-Talk-calls-become-tickets

How to merge tickets: https://support.zendesk.com/hc/en-us/articles/4408882445594

How to merge a user: https://support.zendesk.com/hc/en-us/articles/4408887695898